On Monday 19 March 2012 07:22:52 Renk Thorsten wrote:
> > You ought to be able to initialize any vehicle at any altitude (up to and
> > even beyond 3000 km). At this time, only the Vostok has control jets, as
> > far as I know.
>
> Actually I can not do that. Trying to initialize the ufo at 1.000.000 ft
> works fine, and so does flying the ufo to the altitude. I've then removed
> the altitude limit detection from the Vostok model leading to an automatic
> scenario termination. Trying to initialize Vostok at 1.000.000 ft causes
> Flightgear not to load properly (it gets stuck and some JSBSim messages
> never appear), trying to fly up beyond 150 km altitude causes a crash of FG
> shortly after reaching the red zone. So something is happening with a
> JSBSim model which isn't happening with the ufo FDM.
>
> Cheers,
>
> * Thorsten
I assume you ran into a bunch of PT_vs_hpt: ran out of layers for h= messages.
This is from FlightGear's rather brittle atmosphere model. The attached patch
adds a deep-space layer out to 1e9 meters. I just arbitrarily set the
pressure to near 0 and the temperature to damn cold. This patch let me
initialize a random JSBSim model at a million feet, however there were still
some NaNs present in the property tree when I made it back to sea-level.
Ron
I sent this half an hour ago, and sourceforge ate it. I'll send it again to
see if this one comes through in a timely fashion...
diff --git a/src/Environment/atmosphere.cxx b/src/Environment/atmosphere.cxx
index 022ea54..f16005f 100644
--- a/src/Environment/atmosphere.cxx
+++ b/src/Environment/atmosphere.cxx
@@ -18,7 +18,8 @@ ISA_layer(3, 32000, 104986, 868.019, 0.256326, 228.65, -44.50, -0.0028, -
ISA_layer(4, 47000, 154199, 110.906, 0.0327506, 270.65, -2.50, 0, 0),
ISA_layer(5, 51000, 167322, 66.9389, 0.0197670, 270.65, -2.50, 0.0028, 0.0008534),
ISA_layer(6, 71000, 232939, 3.95642, 0.00116833, 214.65, -58.50, 0.0020, 0.0006096),
-ISA_layer(7, 80000, 262467, 0.88628, 0.000261718, 196.65, -76.50),
+ISA_layer(7, 80000, 262467, 0.88628, 0.000261718, 196.65, -76.50, 0.0, 0.0),
+ISA_layer(8, 1.0e9, 3.28e9, 0.00001, 3.0e-9, 2.73, -270.4, 0.0, 0.0),
};
const int ISA_def_size(sizeof(ISA_def) / sizeof(ISA_layer));
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